You're looking at Tower Snake, a spiral ramp built with bamboo and cast-aluminum snake skeleton by Chinese artist Huang Yong Ping, currently on display at the Gladstone Gallery in New York.

The Gallery describes Yong Ping's creation in amusing art-speak as "subtly transforming the cruciform symbol of Christian salvation into the tangled figure of Edenic tempation" (huh?) but I say it's pretty darn cool to imagine walking into the belly of a giant snake: Link | More photos at the Gladstone Gallery